Pair Lab — every fit, every test, every spread.

Pick a pair from the deck below. The Lab recomputes the cointegration test, hedge ratios from three estimators, the rolling spread, the z-score signal, the OU half-life and an Amihud illiquidity score — all client-side, on every change. For KPSS, VR, Hurst, CUSUM and Johansen on the same pair, see /methods.